Lamp having a reflector, two lenses, and means to vary the distance between them



STRONG EFLECTOR, TWO LENSES, AND

19 H. H. Aug LAMP HAVING A R MEANS To VARY THE DISTANCE BETWEEN THEM 3 Sheets-Sheet 1 Filed July 12, 1949 FIG.- u

FIG-3 FlGrl G N 0 W 5R w HN. E w Rll R A H ATTORNE Y H. H. STRONG 1953 LAMP HAVING A REFLECTOR, Two LENSES, AND

MEANS TO VARY THE DISTANCE BETWEEN THEM s Sheets-Sheet 2 Filed July 12, 1949 FIG-IO HARRY H. smo/ve INVENTOR ATTORNEY H. H. STRONG u 251953 LAMP HAVING'A REFLECTOR, Two LENSES, AND 2650292 MEANS TO VARY THE DISTANCE BETWEEN THEM Filed July 12, 1949 Y s Sheets-Sheet s a 5 92 8b 151 I 89 i j q /o T /00 I H 1 E .1 I 94 1 2%; I 74 i 9g V I I1, I I ::::::..22 1'" E e: 5/ I as 0 9a 183 88 q 99 8% Fl s: 6 9

HARRY H. STRONG E TOR AT ORNEY Patented Aug. 25, 1953 A REFLECdtQR, 'EWQiEENSES, aNDl' MEANShTQ VARY THE; BE:-

IWEEN THEM Harry'H; Strong, Toledo, Ohio; assi'g nor to The Strong- Electric- Corporation; Toledo; Ohio; a

corporation of Ohio Application Jul-y, 12,,1949,,SeniaLNorLll4J59 7 Gl'aims;

Myinventiion relates to. lamps, and particularly to lamps for projecting a spot or beam of light, and the, principal object of my invention is to provide a: new and improved lamp particularly for that purpose:

In the present embodiment, light from a suitable source, such as an electric arc, is projected by means or an optical system comprising a, focusing reflectonand two' successive lenses adjustable tc-produce a beam of proper focus considering particularly the distance to the area. to be iliuminated As is understood by those skilled in the art, provision of a proper beam under the various adiustments' requiresnot' onlyvariation in the distance between the two lenses, but alsocorresponding variation in the distance between the reflector and the first of the lenses-, and therefore; in the situation where the reflector is essenti allyr stationary; movements of both of the lenses, andin predetermined varying ratio.

A particular purpose of my invention is to provide improved means for suitablyaccomplishing such movements: ofi the lenses; and another purpose of ma -invention is to provide means" for varying the cross-section of the projected beam. In thedrawings accompanying this specifioa tion and forming a part ofthisapplication I" have shown, for purposes.- of illustration, what It now consider to bethe best" mode of carrying intention into. practice, and inthese drawings-r Figure. 15 is a side elevation of the illustrative embodiment of my invention Figures 2% and 3 are-respectively front andrearelevations; but omitting the lower portions ofthe' supporting: stand;

Figures 4 and 5 are enlarged side viewsof respectivelyr the rear and: front portion of the lamp unit with the door of therear casing open, theflront casing removed; and certain parts-in vertical section;

Figures 6 and 7- areplan viewsof the front portion of the lamp unit ShOWil'lg particularly the mechanism interconnecting the two lens units; and showing the lens units respectively in their extreme spaced and extreme approached positions:

Figures 8 and 9- are elevational' views on the: lines 8-&' and 99' of Figure 6', showing respectively the front and rear lensunits; and

Figures 10; 11, and 12, are views on the lines |'o-|-n= and Hl| of Figure 5; and on the line |'2l 2- of Figure 11-, showing particularly the; aperture unit;

The present embodiment my-inventioncomprises alamn unit L supportedbs: a tan s' omprjising a base. 2|. provided atv its upper end: with rclamn 2.2. in which. is ad'iusta x m un d a column 23 havin at. its. upp r nd: a lamp 21 inwhich is adjustably mounted, astud: 25 carrying a forkjfi provided adjacent its free ends. 2:1: with trunnions 28 on which is pivotally mounted a cradle 2,9 in which is, flxed= the base channel" 30 of the lamp unit L,

Fixediy mounted. on the base channel" 30: are a rear end plate 34 constituting the closure tor the rear end of the lamp housing, and a part1- tion 32 diyiding the lamp unit L into a reai-section R and a front, section F but". cqmpri'sing a conical tube 33 afiording an opening; vfrom the one section to the other; and relativelyfixedly mounted on the, base channel; 30; are a reflector support, 34'" located in the rear portion R; and an aperture support 351 located in the front section F:

Garried by the endplate 3t and partition 32* isatop housing member 36 to the longitudinar edges of which, are pivoted side housing; members 31 and 38' serving" to complete the housing of the-rear-section R; andcarried ona shoulder 39 0f the partition 32 isa conical tube 40" constituting the housing of the: front section F:

' Reciprocally mounted on longitudinal rodssupported bythe base channel 30 are rear and" front electrode carriers M" and 42 carrying rear and front electrodes and M; and universallypivotally' mounted on the reflector support 34;- isa reflector carrier 45- carryinga reflector 46 disposedin appropriate relation to thearcproduced between the electrodes 43' and 44 In the present embodiment the electrodes 43 and M are fed byrotation of a crank 41 located rearwardly'of the end plate 31; and actuating a shaft 48 operatin through sorew'mechanism: to efi ect opposite movements of the electrode carr-i'ers- 4t and 42 in amanner weliknown: in the art, and the angular position of the reflector may" be adjusted by means of reciprocable rods 5'! rear and front lenses 8! and 82 are carried by rear and front lens carriers 83 and 84, and to provide the desired adjustability of the lenses the carriers 83 and 84 are longitudinally reciprocally mounted respectively on rods 85 and 88 supported by a bracket 81 carried by the base channel 38, and on rods 88 and 89 carried directly by the base channel 38.

Similarly, to provide the desired simultaneous movement of the lenses, in inverse directions and in varying ratio, interconnecting the lens carriers 83 and 84 is a strap 98 connected at its one end 9| to a fitting 92 secured to the rear lens carrier 83, passing over a fixed pulley 93 mounted on the base channel'38, a secondpulley '94 mounted on the front lens carrier 84, and a further fixed pulley 95 supported on the base channel 38, and secured at its other end 98 to an abutment 91 adjustably mounted to provide for initial adjustment of'the relative positions of the lenses BI and 82.

In the present embodiment the abutment 91 therefore is screw-threadedly carried on a transverse shaft 98 rotatably mounted in the forward end of the, flanges of the base channel 38 and conveniently rotated by means of terminal knobs 99, the strap 98 is maintained against slack by means of a tension spring I88 extending between the fitting 92 of the rear lens carrier 83 and an attachment I8l struck from the base channel 38,

and the lense'sare conveniently moved by means of handles 1 82'extending laterally from the front lens carrier 84.

Thus movement of the front lens 82 by means of either of the handles 182, by reason of the strap 98 and the arrangement of the strap 98 and its associated pulleys, automatically will result in movement of the rear lens 8| in the inverse direction and to the proper extent, whereby over the entire range of adjustment of the spread of the beam, from the one extreme indicated in Figure 6 to the other extreme indicated in Figure 7, the lenses and the reflector continually will be maintained in correct optical relation.

However, particularly with the range of adjustment herein indicated, it is desirable that means be provided to vary the size of the light aperture, and accordingly the present embodiment includes means for that purpose, shown particularly in Figure 10, and in the present embodiment comprising a plate 53 pivoted to the aperture support at 54, provided with large and small apertures 55 and 58 either of which may be brought into operative position merely by pivotal movement of the plate 53, and conveniently operated by means of a leverp51 secured to the plate 53 and extending through a slot 58 in the front section housing 48 and desirably provided with a suitable knob 59.

, On .the other hand, the present embodiment includes also means for varying the shape of the beam, shown particularly in Figures 11 and 12, and in the present form comprising a T-shape member 88 vertically reciprocally mounted by disposition of its head 8| in a slideway formed by the aperture support 35 and a spacing bar 82 and a plate 83 riveted or otherwise suitably secured to the support 35, an inverted L-shape member 64 vertically reciprocally mounted by disposition of its vertical arm 85 in a slideway formed by the aperture support 35 and a spacingv bar 88 and a plate 8'! riveted or otherwise suitably secured to the support 35, an ang ularly adjustable lower cut-01f plate I1 pivotally supported qea liccatri g r the st m 9 the -shw '4 member 88, and an angularly adjustable upper cut-off plate 88 pivotally supported on a pin 19 carried by the horizontal arm 18 of the inverted L-shape member 84.

With the above the present means for varying the shape of the beam includes. also mechanism for simultaneously vertically reciprocating the members 88 and 84 in'inv'erse directions, and thereby simultaneously vertically translating the cut-off plates 11 and 88 in inverse directions, herein shown as comprising a plate 88 pivoted on a pin 89 carried by the aperture support 35, rods 18 and H connecting from the members 88 and 84 to opposite lateral portions of the plate 88, and an operating lever 12 extending from the plate 88 through a slot 13 in the front section housing 48 and provided for convenience with an operating knob 14, whereby simple operation of the lever 12 results in restrictively varying the shape of the beam, according to the space remaining between the cut-off plates 11 and 88, determined by the angular position to which the plates 11 and 88 have been previously adjusted and by the extent of movement of the lever 12 and consequent extent of translation of the plates 11 and 88.

From the foregoing it will be apparent to those skilled in the art, that the particular embodiment of my invention herein shown and described in any event accomplishes at least the principal objects of my invention.

On the other hand, also it will be apparent to those skilled in the art, that the present embodiment of my invention accomplishes advane' tages other than those specifically indicated, and further, that various changes and modifications may be made Without sacrificing any or all of the various advantages, and therefore it is to be understood that the particular embodiment herein shown and described is presented for purposes of illustration, and my invention is to be regarded as defined by my claims. Wherefore I claim:

1. In a lighteprojecting apparatus, a support,

means for establishing a beam of light including a light source; a pair of relatively movable lenses arranged in the path of the beam of light; a carrier for each of said lenses movable upon the support axially of the light beam; a flexible member; means for anchoring the member to the support; means connecting the flexible member to one of the lens carriers; an element carried by the support; said flexible member engaging and passingover said element; means for maintaining tension in said flexible element, and means mounted on the other of said carriers engageable with the flexible member for varyingly deflecting the flexible member during relative movement of one of said carriers to concomitantly effect movement of the other carrier at a difierent speed in a reverse direction. V

2. In a light-projecting apparatus, a support, means for establishing a beam of light including a light source; a pair of relatively movable lenses arranged in the path of the beam of light; a carrier for each of said lenses mounted upon and movable relative to the support; a flexible member; means anchoring one end of the member to the support; an element mounted upon the support; said flexible member being retroflexed around the element and having its other end connected to one of said lens carriers; means on the other of said lens carriers engagin the flexible element whereby movement of said latter meet eeed, carr d ?9. s id flex e, memb r to cause relative movement of the other lens carrier in the opposite direction, and yieldable means for biasing said carriers toward an initial position.

3. In a light-projecting apparatus, a support, means for establishing a beam of light including a light source; a pair of relatively movable lenses arranged in the path of the beam of light; a carrier for each of said lenses mounted upon and movable relative to the support in directions axially of the beam of light; a flexible member; means anchoring one end of the member to the support; means for adjusting the anchoring means relative to the support; an element mounted upon the support; said flexible member being retroflexed around the element and having its other end connected to one of said lens carriers; means on the other of said lens carriers engaging the flexible element whereby movement of said latter mentioned carrier deflects said flexible member to cause relative movement of the other lens carrier in the opposite direction, and yieldable means for maintaining tension in said flexible member.

4. In a light-projecting apparatus, a support, means for establishing a beam of light including a light source; a pair of relatively movable lenses arranged in the path of the beam of light; a carrier for each of said lenses mounted upon and movable relative to the support; a flexible member; means for anchoring one end of the flexible member to the support; means for anchoring the other end of the flexible member to one of said lens carriers; one of said anchoring means being adjustable to initially position the lens carriers; an element mounted upon the support; said flexible member being retroflexed around said element; means on said other lens carrier engageable with the flexible member for varyingly deflectin the flexible member to cause relative movement of the first mentioned lens carrier in the opposite direction at a different speed, and means for biasing the lens carriers toward an initial position.

5. In a light-projecting apparatus, a support, means for establishing a beam of light including a light source; a pair of relatively movable lenses arranged in the path of the beam of light; a carrier for each of said lenses mounted upon and movable relative to the support; a flexible cable; means for securing the cable to the support and to one of the lens carriers; guide means for confining movement of the lens carriers longitudinally of the light beam, a pulley journalled upon the support, said cable being retrofiexed around the pulley; a pulley journalled upon the other of said lens carriers and engaging the cable whereby longitudinal movement of the pulley-bearing carrier varyingly deflects the cable causing movement of the first mentioned lens carrier in the opposite direction at a different speed ratio for varying the characteristics of the light beam, and resilient means for maintaining tension upon the cable.

6. Apparatus for producing a spot or beam of light, comprising means including a light source arranged to produce a beam of light, a first lens disposed to receive said beam and to project a consequent beam, a second lens disposed to receive said consequent beam and to project a resulting beam, a relatively movable carrier for each of said lenses, means for adjusting the carriers longitudinally of the light course, thereby to vary the spread of the resulting beam, said adjusting means including a flexible cable, relatively stationary cable attachment means for anchoring one end of said cable, a second cable attachment means connecting the cable to one of the carriers, relatively stationary cable guiding means mounted beyond said second attachment means, said cable engaging said guide means, means on the other of said lens carriers engaging the flexible cable whereby movement of said latter-mentioned carrier deflects said flexible cable to cause relative movement of the other lens carrier in the opposite direction, and means for maintaining tension in the flexible cable.

7. An optical mechanism comprising two successive lenses, a support, a light source; means including a relatively movable carrier supporting each of said lenses to permit relative movement of said lenses longitudinally of the light course therebetween, motion-transmitting means connecting said lenses whereby movement of one of said lenses longitudinally of said light course will cause movement of the other of said. lenses longitudinally of said light course in the direction and to an extent to maintain substantially a desired optical relation, said motion-transmitting means including a flexible cable; relatively stationary cable attachment means for anchoring the cable; second cable attachment means connecting the cable to one of said lens carriers; an element mounted upon the support beyond. said second attachment means, said cable being retroflexed round the element, means on the other of said carriers engaging the flexible element whereby movement of the latter-mentioned carrier deflects the flexible cable to cause relative movement of the other lens carrier in the opposite direction at a different speed, and means for maintaining said cable in tension.

HARRY H. STRONG.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,709,626 McGunnigle Apr. 16, 1929 1,737,993 Bowen Dec. 3, 1929 1,755,105 Douglass Apr. 15, 1930 1,898,471 Walker Feb. 21, 1933 1,950,166 Durholz Mar. 6, 1934 1,988,390 Naumann Jan. 15, 1935 2,076,240 Levy Apr. 6, 1937 2,347,771 Dion et al. v May 2, 1944 2,356,620 Schade Aug. 22, 1944 2,425,863 Carlson Aug. 19, 1947 

